Cooking for myself became easier when I started using rice/quinoa/beans + meat with vegetables. The first part is a single pot, and can usually be made in large enough quantity to last most of the week (via reheating or reuse, like old rice into fried rice). The second part can also be done in a single pot. And I have found that vegetables last far enough into the week that usually one trip covers me. To handle running out, make stews and other freezable things for the end of the week (or to mix things up earlier in the week) and store in single-serving portions.
I had periods of doing something similar too. Make a pot of stew / curry / jambalaya with rice, eat with some salad.
Advantage of stew / curry is they can be frozen and later thawed and reheated. Over time though it got really monotonous for me. I like good food, and importantly variety.
Feels like there is some opportunity here. A way to scale home cooking for a bunch of individuals. Like if a few people in close proximity, say in the same apartment complex, rotated responsibilities for cooking. You can get bulk savings, time savings and variety.
The real thing would be to have a freezer. Cook enough for now and freeze a cache for later. Do this quick enough and you’ll be able to stock up multiple recipes in the freezer with omit needing to cook once a week (for me, preferably). My trouble is my apartment won’t allow a freezer.
Not everything is freezer friendly though. Many seafood tastes pretty bad after being frozen and reheated. Ditto for anything that is supposed to be crispy / crunchy etc or any texture that’s not soft.